Revert "Support dynamic default value for KeyValue widget"

This reverts commit f483e81.

src/lib/services/contents/draft/create.js

@@ -1,4 +1,3 @@
-import { isObject } from '@sveltia/utils/object';
 import { stripTags } from '@sveltia/utils/string';
 import { get } from 'svelte/store';
 import { getCollection } from '$lib/services/contents/collection';
@@ -86,22 +85,6 @@ const parseDynamicDefaultValue = ({ fieldConfig, keyPath, newContent, value }) =
     }
   }
 
-  if (widgetName === 'keyvalue') {
-    try {
-      const parsed = JSON.parse(value);
-
-      if (isObject(parsed)) {
-        Object.entries(/** @type {Record<string, string>} */ (parsed)).forEach(([key, val]) => {
-          newContent[`${keyPath}.${key}`] = val;
-        });
-      }
-    } catch {
-      //
-    }
-
-    return;
-  }
-
   // Just use the string as is
   newContent[keyPath] = value;
 };